Re: [w3c/webcomponents] HTML, CSS, and JSON modules shouldn't solely rely on MIME type to change parsing behavior (#839)

> If the request 404's or if, say, the JSON has a parse error, the entire module graph will fail to instantiate/execute.

This might actually be what you want in some cases, e.g. if a critical resource does fail to load then you don't want to waste resources evaluating a bunch of modules you don't need. You can always use `import()` to catch errors in that particularly and do some recovery code or retry.

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